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It's almost pointless to change components with carbofiber items aside from the hood (and the boot, but less so, as some weight in the back can help to put the power down), which in a car with a mid/front mounted engine can be heavy if it's not alumium.
The roof is more complicated but as it's on top you get less pitch and rollif it's lighter...BMW M3s and M6s have a carbonfibre roof for this reason..Some Lancer Evos have an alluminium roof.
Instead fitting ligher, non suspended parts, like the wheels, can do miracles both on the performance but also on the handling.
Some very light but strong wheel, like the OZ Alleggerita, can reduce the total wheel weight by 3-4 X4 kg= 12/16 kg and that's A LOT both for the flywheel effect and for the supension control.
The driveshafts have some flywheel effect but this effect is directly proportional to the distance between the weight and the centre of rotation, so even it weights as much as a wheel or two, the total effect it's much lower.
The flywheel itself is larger in diameter so if you change it with a lighter one you'll feel the effect much more.
Lexan or thinner glass windows can help, light seats even more.
Usually on a medium road car you can get 80 kg froma "mild diet" of carbon fibre and glassfibre components, fixed seats, lighter wheels, less sound proofing and maybe the removal of the rear seats (which I don't like)
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